[MPlayer-users] UDP -udp-slave video sync

[rob at goto10.org]

 On Wed, 08 Jun 2011 16:58:02 +0100, rob at goto10.org wrote:
> On Wed, 8 Jun 2011 17:24:41 +0200, T.Reifenrath wrote:
>> I still have the same problem......
>>
>> I just get the new Version with this Filename: 
>> MPlayer-athlon-svn-33488
>>
>> Tried to play the  4 Videos on a single machine with these 
>> batch-files:
>>
>> Master:
>> mplayer -udp-master  -noborder -geometry 0:0 -vf scale=128:72 
>> Video1_1.mp4
>
>
>
> hi,
> you need to tell it the broadcast ip of your network (sudo ifconfig
> will show you this)
> mplayer -udp-ip 192.168.1.255 -udp-master Video1_1.mp4
> HTH
> rob

 oops sorry thats not true if you are on the same machine
 you patched the source with the patch from Jason right?
 rob



>
>
>> Slave1:
>> mplayer -udp-slave -noborder -geometry 128:0 -vf scale=128:72 
>> Video1_2.mp4
>>
>> Slave2:
>> mplayer -udp-slave -noborder -geometry 256:0 -vf scale=128:72 
>> Video1_3.mp4
>>
>> Slave3:
>> mplayer -udp-slave -noborder -geometry 384:0 -vf scale=128:72 
>> Video1_4.mp4
>>
>>
>> Videos are running after starting the batch-files ( still get a 
>> message
>> "unsupported Pixelformat 61" / "unsupported Pixelformat 61" )
>> But they don´t sync with the master.
>>
>> If I just start one of the slaves and after the master, the slave is 
>> waiting
>> but does nothing. When the master is finished, the slave ends, too.
>> But this is only if ONE slave is started. When all slave are 
>> started, just
>> the first one is waiting while the others are playing.
>>
>> Can anybody help ???
>>
>>
>> -----Ursprüngliche Nachricht----- From: rob at goto10.org
>> Sent: Wednesday, June 08, 2011 3:40 PM
>> To: Jason Holt
>> Cc: mplayer-users at mplayerhq.hu
>> Subject: Re: [MPlayer-users] UDP -udp-slave video sync
>>
>> On Tue, 7 Jun 2011 18:29:12 -0700, Jason Holt wrote:
>>> On Tue, Jun 7, 2011 at 3:16 PM,  wrote:
>>>
>>>> On Mon, 06 Jun 2011 14:29:12 -0400, Morris Beverly wrote:
>>>>
>>>>> mplayer -udp-slave myvid.mkv
>>>>>
>>>>>> then mplayer should apparently freeze on a frame and wait for
>>>>>> messages from a  master instance - for me this does not happen
>>>>>> - it just plays as normal... i get no error messges about
>>>>> -udp-*
>>>>>> even with a -v
>>>
>>> ...
>>>> i cc in jholt who i think is the author of the patch - and sorry 
>>>> in
>>>> advance if i am missing something obvious
>>>
>>>  This does indeed appear to be broken.  It kinda works if I start
>>> the master first, but not very well.
>>>
>>> If I start it without a master present, it renders frames as fast 
>>> as
>>> it possibly can, because udp_slave_sync() returns immediately, 
>>> causing
>>> sleep_until_update() to return immediately.
>>>
>>> Then, during "normal" playback, once the slave gets synced up with
>>> the master and should be playing in lock step, the 
>>> udp_master_position
>>> ends up == MP_NOPTS_VALUE for about 10 invocations due to the
>>> nonblocking get_udp trying to tell it that there aren't any 
>>> messages
>>> yet.  So udp_slave_sync returns immediately, and mplayer plays 
>>> frames
>>> as fast as it can once again.  When a datagram finally comes in, 
>>> the
>>> slave is way ahead of the master, so it blocks until the master
>>> catches up, then runs ahead again.
>>>
>>> The attached patch makes the slave block if the master isn't up 
>>> yet,
>>> which was the original behavior, and which I think is better than
>>> having it play normally in most instances.  (If you gave -udp-sync,
>>> you probably want it to wait.)  And it makes udp_master_position
>>> static, so that it's only set to MP_NOPTS_VALUE on startup and 
>>> after
>>> blocking get_udp calls.
>>
>> ok great thank you! - i applied the patch and now it works as 
>> expected
>> - the only thing i have noticed is that the audio and video go out 
>> of
>> sync on the slave instance -  its as if the udp packets tell the 
>> video
>> which frame it should be playing but the audio doesnt jump to keep 
>> up
>>
>> i tried passing mplayer some flags to try and fix it -mc 1 -autosync 
>> 1
>> etc but none made any difference
>>
>> any clue how this could be fixed so the audio and video stay in sync 
>> on
>> the slave instances?
>>
>> (i know if i were doing a video wall then you could just use the 
>> audio
>> from one source - but this is not what i am doing)
>>
>> thanks for the quick reply and patch fix!
>>
>> rob
>>
>>
>>
>>
>>
>>
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